Please do help me with this calculus problems pleaseee. I need the correct letter of the answer and the complete solution. Please please. I promise to give a perfect score as a feedback...

20. Find the hydrostatic force on the plate submerged in water as shown in the image below. 6 8 A. 961,000 N B. 891,00 N C. 981,000 N Page of D. none of the above19. Determine the hydrostatic force on the following triangular plate that is submerged in water as shown. Page of waters surface om 4m A. 156,960 N B. 165,960 N C. 155,960 N D. none of the above17. A spring has a natural length of 20 cm. A 40 N force is required to stretch (and hold the spring) to a length of 30 cm. How much work is done in stretching the spring from 35 cm to 38 cm? A. 1.68 J B. 1.98 J C. 1.88 J D. 1.78 J 18. A cable with mass 12 kg/meter is lifting a load of 150 kg that is initially at the bottom of a 50-meter shaft. How much work is required to lift the load 4 of the way up the shaft? A. 21,044.6775 J B. 21,054.6875 J C. 21,054.6775 J D. 21,055.6775 J15. Find the volumes of the solids generated by revolving the regions hounded by the graphs of the equations 3! = x2 and v = 6s- 1:2 about the given lines a-axis and v=. A. 3T1: B. 2'31: C. 1'11: D. 4'11: 16. A cup like object is made by rotating the area between 3: = 232 and y = n+1 with a} 0 around the x-aais. Find the volume of the material needed to make the cup. A. 4.9]? cubic em 13.4.31? cubic em. C. 4.9]? cubic em Page of D. 4.?17 eubie em